chore: estate-wide chore + stale-path sweep (2026-04-17)

Part of the estate-wide 2026-04-17 cleanup pass. Commits chore-safe
content only: docs, workflow YAML, gitignore, a2ml migration drift,
editorconfig, ncl. Dependency manifests (Cargo.toml/.lock, package.json,
mix.exs, etc.) and source files intentionally held back so no broken
intermediate states where a .rs commit splits from its Cargo.toml.

Also includes stale-path fixes for four ecosystem moves:
  hypatia       -> verification-ecosystem/hypatia
  echidna       -> verification-ecosystem/echidna
  ephapax       -> developer-ecosystem/nextgen-languages/ephapax
  panic-attacker -> games-ecosystem/panic-attacker

Staged files: 5
Held back (source / dep-manifests): 0

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.gitignore

@@ -78,3 +78,11 @@ tests/pyo3-integration/.venv/
 tests/pyo3-integration/target/
 tests/pyo3-integration/.pytest_cache/
 tests/pyo3-integration/__pycache__/
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+build/
+dist/

ephapax-ir/idris2/.gitignore

@@ -4,3 +4,14 @@ build/
 *.ttm
 *.so
 *.ss
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+*.log
+*.tmp
+.DS_Store
+Thumbs.db
+dist/

examples/mixed-transport/.gitignore

@@ -18,3 +18,15 @@ venv/
 .idea/
 *.swp
 *.swo
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+*.log
+*.tmp
+.DS_Store
+Thumbs.db
+build/
+dist/

examples/zero-copy-demo/.gitignore

@@ -18,3 +18,15 @@ venv/
 .idea/
 *.swp
 *.swo
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+*.log
+*.tmp
+.DS_Store
+Thumbs.db
+build/
+dist/

explorer/crawler/.gitignore

@@ -22,3 +22,15 @@ erl_crash.dump
 # Ignore package tarball (built via "mix hex.build").
 crawler-*.tar
 
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+*.log
+*.tmp
+.DS_Store
+Thumbs.db
+build/
+dist/